I purchased a Ruger Mini-30 about a year ago, and mounted a Bushnell "Dusk/Dawn" 1.5x-4.5x scope on it. Firing from bench, it would group about 3" at 100 yards with almost any kind of ammo, using both Russian (Wolf - 123gr HP) and Federal (123gr SP).
I used it this fall (2004) for hunting in northern Minnesota, thinking that in my friend's 40 acres that I wasn't going to get a shot long enough to justify using the .30-06. But a nice big doe popped up on the FAR side of a clearing, and I had a clear, standing broadside shot at her. I took the shot, but she whirled just as I pulled the trigger. She flinched, hunched up, and took a dozen bounds into the swamp behind the clearing. I waited 10 minutes, and paced the 125 yards across the clearing to where she'd been when I fired. Found a big blood splash about 2-1/2 feet up on a tree trunk, and followed the blood trail into the swamp. I found her lying down about 20 yards into the swamp, still breathing but not able to move. After I put a round into the neck, I started to drag her out to some high ground...the front leg almost came off. I had hit her high and towards the front, and the bullet had impacted directly on the big ball joint in the shoulder.
Later, when I got her skinned (skun?), I found that the ball joint had basically exploded...there was nothing left but shards of bone. The bullet continued on down the inside of the rib cage, nicking one of the ribs as it entered, and exited out through the abdomen, with pretty fair-sized hole indicating (at least, to me) that the hollow-point Russian round had done a pretty good job of expanding. I didn't recover the slug, since it had been left in the swamp.
I'm pretty confident with this round now, and I'm sure that if I'd hit where I was aiming (heart/lung broadside) that she wouldn't have gone more than a few steps before dropping. Even with the poor shot placement, she didn't travel more than about 40 yards total before falling.
Here's an interesting problem. I purchased another Ruger for my wife, she having tried it at the range, and wanting something a little nicer than the SKS she regularly shoots. This second one won't group for spit. Even using the Federal ammo, it won't do better than a 4" group at 100 yards, and with the Russian (or even some of the old Chinese stuff) they open up into 8" or 9" "groups"...more like "patterns". This is when I started hitting some web sites, and learned that this is considered "normal" for a Mini-30. Even calling Ruger didn't help. I guess I just got lucky with the first one.
So I'm going to trade the second Mini-30 (plus a little cash, I'm sure) for a CZ 527 in this caliber. I'm happy to see that people have fairly good accuracy with a wide variety of ammo in this firearm.